A billion solar mass black hole would still have a radius of only:
A)20 A.U.
B)15 parsecs.
C)150 kilometers.
D)3 kpc.
E)two million light-years.

Question

Quizplus · Accepted Answer

The radius of a black hole, defined by its Schwarzschild radius, is directly proportional to its mass. For a black hole with a mass of a billion (10^9) solar masses, the Schwarzschild radius would be approximately 20 astronomical units (A.U.), where 1 A.U. is the average distance from the Earth to the Sun.

A Billion Solar Mass Black Hole Would Still Have a Radius